Crontab eraser for automatic remove of crontab entries.

Crontab_ eraser.sh

#!/bin/bash
#
#########################################
##Autor:        Juan Manuel Parrilla
##Descr:        This script will remove a especific crontab entry from /etc/crontab file 
#########################################
##
## THIS SCRIPT NEED SUDO PERMS TO MODIFY CRONTAB FILE
## How to use: 
## $1 --> Pattern to find crontab entry (EG) Script name or something 
CRONTAB_FILE="/etc/crontab"
CRONTAB_FILE_BCK="/etc/crontab.bck"
TMP_CRONTAB_FILE="/tmp/crontab"
PATTERN="$1"

[ -f $CRONTAB_FILE ] || (echo "The Crontab file doesn't exist, maybe this script isnt supported for your SO" && exit -1)

finder() {
	entry="$(cat $CRONTAB_FILE | grep $PATTERN)"
	if [ "$PATTERN" == "" ]; then
		echo "You must to introduce pattern to identify the Crontab entry" && exit -1
		if [ "$entry" == "" ];then
			echo "Pattern not Found" && exit -1
		else
			echo "Founded!"
		fi
	fi
}

remover() {
	while read line
	do
		if [ "$line" != "$entry" ];then
			echo "$line"  > $TMP_CRONTAB_FILE
		fi
	done < $CRONTAB_FILE
}

replace() {
	echo "Making a Backup of your Crontab file"
	su - root -c "mv $CRONTAB_FILE $CRONTAB_FILE_BCK"
	echo "Replacing..."
	su - root -c "mv $TMP_CRONTAB_FILE $CRONTAB_FILE "
}

finder
remover
replace